Entity

Time filter

Source Type


Gholipour M.,Islamic Azad University at Behshahr
Communications in Computer and Information Science | Year: 2011

In this paper we present an FPGA implementation of 5/3 Discrete Wavelet Transform (DWT), which is used in image compression. The 5/3 lifting-based wavelet transform is modeled and simulated using MATLAB. DSP implementation methodologies are used to optimize the required hardware. The signal flow graph and dependence graph are derived and optimized to implement the hardware description of the circuit in Verilog. The circuit code then has been synthesized and realized using Field Programmable Gate Array (FPGA) of FLEX10KE family. Post-synthesis simulations confirm the circuit operation and efficiency. © 2011 Springer-Verlag Berlin Heidelberg. Source


Reza Zardoost M.,Islamic Azad University at Qaemshahr | Dehbandi B.,Islamic Azad University at Behshahr
Physica E: Low-Dimensional Systems and Nanostructures | Year: 2013

Electronic structure properties including bond lengths, bond angles, dipole moments (μ), energies, band gaps, NMR parameters of the isotropic and anisotropic chemical shielding parameters for the sites of various atoms were calculated using the density functional theory for Si, Ge, Sn, Pb doped (6,3) Chiral single-walled carbon nanotubes (SWCNTs). The calculations indicated that average bond lengths were as: Pb3C>Sn3C>Ge3C>Si3C>C3C. The dipole moments for Si, Ge, Sn, Pb doped (6,3) Chiral single-walled carbon nanotubes structures show fairly large changes with respect to the pristine model. © 2013 Elsevier B.V. Source


Rohani A.,Islamic Azad University at Shiraz | Tirtashi M.R.S.,Islamic Azad University at Behshahr | Noroozian R.,University of Zanjan
Journal of Power Electronics | Year: 2011

In this paper a robust method is presented for the combined design of STATCOM and Power System Stabilizer (PSS) controllers in order to enhance the damping of the low frequency oscillations in power systems. The combined design problems among PSS and STATCOM internal ac and dc voltage controllers has been taken into consideration. The equations that describe the proposed system have been linearized and a Fuzzy Logic Controller (FLC) has been designed for the PSS. Then, the Particle Swarm Optimization technique (PSO) which has a strong ability to find the most optimistic results is employed to search for the optimal STATCOM controller parameters. The proposed controllers are evaluated on a single machine infinite bus power system with the STATCOM installed in the midpoint of the transmission line. The results analysis reveals that the combined design has an excellent capability in damping a power system's low frequency oscillations, and that it greatly enhances the dynamic stability of power systems. Moreover, a system performance analysis under different operating conditions and some performance indices studies show the effectiveness of the combined design. Source


Gholipour M.,Islamic Azad University at Behshahr | Noubari H.A.,University of Tehran
ICSPS 2010 - Proceedings of the 2010 2nd International Conference on Signal Processing Systems | Year: 2010

In this paper, a VLSI implementation of the lifting-based Discrete Wavelet Transform (DWT) is presented. The behavioral description of integer-to-integer CDF (2,2) lifting wavelet, which is used in image compression has been coded in Verilog Hardware Description Language (HDL). The code has been synthesized and then implemented using both Field Programmable Gate Array (FPGA) and Application Specific Integrated Circuit (ASIC) design approaches. Post-synthesis and post-layout simulations verify the appropriate operation of he architecture. The resulting hardware can be used in image compression applications such as JPEG2000. © 2010 IEEE. Source


Rostami M.M.,Islamic Azad University at Behshahr
2012 Proceedings of 17th Conference on Electrical Power Distribution, EPDC 2012 | Year: 2012

By the help of reactive power, different technological index could be improved in strength System. Voltage stability margin, considered as one the important index of strength system security determination. In this way, effects of Economic performance of ISO (Independent System Operator) must be investigated over reactive power dispatch. In reactive power optimal dispatch, usually voltage stability limit in crease per reactive power minimum cost describes as the main goal of this issue on the other hand, different purposes in reactive power. Short - term planning could be expressed as non - liner optimization issue. in this paper, one the newest methods of intelligent search called PSO Algorithm introduced for these models solution could be used that its capability evaluated by applying an Algorithm in optimal supplying of required reactive power for WSCC, 9-Bus System. Responses compared with genetic Algorithm method. © 2012 Iranian Association of Elect. Source

Discover hidden collaborations